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O\u2010<jats:italic>exo<\/jats:italic> adducts were obtained as the major product, and O\u2010<jats:italic>endo<\/jats:italic> adducts were the minor product. O\u2010<jats:italic>exo<\/jats:italic> and O\u2010<jats:italic>endo<\/jats:italic> indicate the position of an oxygen atom with respect to the central phosphepine framework. The isomers of dibenzo[<jats:italic>b<\/jats:italic>,<jats:italic>d<\/jats:italic>]phosphepine oxides with methyl and phenyl groups in an adjacent position (shown as <jats:bold>2\u2009a<\/jats:bold> and <jats:bold>3\u2009a<\/jats:bold> in the main text) were determined by X\u2010ray crystallographic analysis. O\u2010<jats:italic>exo<\/jats:italic> and O\u2010<jats:italic>endo<\/jats:italic> adducts are diastereomers owing to the central chirality of the phosphorus atom and the planar chirality of phosphepine, and they are interconverted through a ring inversion of phosphepine via a transition state with a planar structure. The inversion barrier, fully estimated through theoretical calculations, drastically varied depending on the substituents in the phosphepine framework and\/or the fusion of benzene and thiophene rings. Furthermore, the kinetics of the thermal isomerization of less stable O\u2010<jats:italic>endo<\/jats:italic> product <jats:bold>3\u2009a<\/jats:bold> into O\u2010<jats:italic>exo<\/jats:italic> product <jats:bold>2\u2009a<\/jats:bold> was examined.<\/jats:p>","DOI":"10.1002\/chem.202404731","type":"journal-article","created":{"date-parts":[[2025,1,23]],"date-time":"2025-01-23T22:29:15Z","timestamp":1737671355000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Benzo\u2010Fused Phosphepines: Synthesis by Gold(I)\u2010Catalyzed Intramolecular Hydroarylation and Ring Inversion"],"prefix":"10.1002","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9392-539X","authenticated-orcid":false,"given":"Akihiro","family":"Tsurusaki","sequence":"first","affiliation":[{"name":"Department of Chemistry, Graduate School of Science Osaka Metropolitan University  3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marii","family":"Kishimoto","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Graduate School of Science Osaka Metropolitan University  3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akihiro","family":"Komura","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Graduate School of Science Osaka Metropolitan University  3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rikako","family":"Ura","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Graduate School of Science Osaka Metropolitan University  3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7844-4993","authenticated-orcid":false,"given":"Ken","family":"Kamikawa","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Graduate School of Science Osaka Metropolitan University  3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,14]]},"reference":[{"key":"e_1_2_6_1_1","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","first-page":"287","volume-title":"Applications of Dynamic NMR Spectroscopy to Organic Chemistry","author":"\u014cki M.","year":"1985"},{"key":"e_1_2_6_3_2","first-page":"23","volume":"10","author":"Belostotskii A. 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